An indoor simulation test device and method for the formation of bridge deck asphalt pavement bulges

Abstract

The invention discloses an indoor simulation test device and method for deck asphalt laying bulging formation. For the purpose, the deck laying layer bulging form change features along with the time are recorded; the bulging typical feature parameter vertical flexibility, unsticking radii, influence factors for analyzing bulging formation, and evaluation indexes of bulging resistance capability of different laying layers are obtained and are used as subsequent finite element model verification parameters. The device adopts the technical scheme that the test device mainly comprises assemblies including a support frame, an environment box, a test piece fixing frame, an MTI-3D structural deformation measuring system and the like. The experiment process comprises the steps of test piece preparation, test piece installation, test environment setting, bulging whole site displacement measurement and the like. By using the device and the method, the accelerated simulation of the bulging disease occurring process in construction and operation of different types of deck laying materials can be realized; the bulging development form can be recorded in the whole process; the whole site displacement and strain features of bulges in different stages can be obtained; the important significance is realized on studying the major influence factors of the bulging formation and disclosing the bulging formation mechanism.

Description

technical field [0001] The invention belongs to the technical field of bridge deck asphalt pavement disease prevention and control, and in particular relates to an indoor simulation test device and method for bridge deck asphalt pavement bulge formation. Background technique [0002] In recent years, the construction of highways has developed to mountainous areas, and the proportion of bridges in the route has been increasing. The prevention and treatment of bridge deck pavement diseases has become more important. With the application of new materials such as epoxy asphalt mixture in bridge deck pavement, cracks and permanent deformation diseases have gradually decreased, but bulging has increasingly become the most important disease type of bridge deck pavement, which has attracted widespread attention. A bridge deck pavement typically consists of a watertight bonding course on the bridge deck, an underlayment and an overlayment. After the air or moisture is mixed between ...

AI Technical Summary

Problems solved by technology

[0005] At present, our country is still blank in the field of simulation test devices and test methods for bulge disease of bridge deck pavement materials. Although some simulation methods have been developed for the formation process of bridge deck or pavement material bulges abroad, there are certain limitations in these experimental devices and test methods. Problem: artificially set the load to form a bulge to simulate the effect of the gas inside the pavement material, but the loading mode of this artificially controlled mechanical load is too simple and simplified compared to the actual gas expansion effect, and the gas contraction and expansion cycle and material properties are affected by temperature at the same time The impact of the change is difficult to simulate in the current experimental device. The failure form of the material bulge is greatly deviated from the actual situation under medium pressure or shaft loading; the most important thing is that the current mechanical loading method will affect the bulge formation process. In fact, the amount of moisture inside the pavement, the dry and wet conditions of the bridge deck, and the porosity of the pavement material may all have an important impact on the actual load, and the influence of these important factors is directly related to the design, guidance of the construction process, but the current mechanical loading simulation methods are difficult to cover

Images